The welding procedure of welding on solar battery sheet
Technical field
The present invention relates to field of photovoltaic technology, particularly relate to the welding procedure of welding on a kind of solar battery sheet.
Background technology
The welding sequence that the main grid of solar battery sheet welds welding is one important procedure in photovoltaic module production process, and the Main Function of welding is the electric current collected on solar battery sheet and is transferred out by electric current.At present in suitability for industrialized production, on solar battery sheet, the welding of welding mainly adopts manual welding: be first placed on upward on workbench by the welding surface of solar battery sheet, then welding to be placed in main gate line and to press welding, using soldering appliance simultaneously---as welding is welded in main gate line by electric iron.During welding, the tin layers on welding surface is melted and is blended on the main grid of solar battery sheet by the high temperature produced by soldering appliance.In above-mentioned welding process, the scolding tin of accumulation is there will be unavoidably at the destination county of welding, this easily causes welding the cell piece of destination county and breaks or hiddenly split phenomenon, and the welding temperature of soldering appliance (being generally 340 ~ 380 DEG C) is much larger than the temperature of solar battery sheet, very large thermal stress can be produced in welding process, easily occur that solar battery sheet breaks or hiddenly splits phenomenon, thus increase the fragment rate of solar battery sheet, enterprise's production cost is higher.
Summary of the invention
The technical problem of solution required for the present invention is: provide one can reduce solar battery sheet percentage of damage in welding process, thus the welding procedure of welding on the solar battery sheet reducing enterprise production cost.
For solving the problem, the technical solution used in the present invention is: described welding procedure step is:
(1) solar battery sheet is faced up be placed on welding tooling, and the main grid on solar battery sheet is longitudinally arranged towards operator, described welding tooling comprises: workbench, workbench is fixedly installed preheating apparatus, preheating apparatus is obliquely installed, solar battery sheet is placed on the operation of preheating apparatus carrying out welding welding, a locating piece is fixedly installed in the lower end of preheating apparatus, the lower end of the solar battery sheet be placed on preheating apparatus is fixed by locating piece, to prevent the downward slippage of solar battery sheet in welding process, locating piece is fixedly installed one piece of strip high temperature cloth, strip high temperature cloth to be adhered fixed on locating piece and to stretch out, before welding, the strip high temperature cloth liner of extension is being welded on the solar battery sheet outside terminal,
(2) preheating apparatus preheating, adopts 500-3C type electric iron and preheats solder horn, making it reach welding temperature; Welding temperature controls within the scope of 320 ~ 360 DEG C;
(3) welding is covered on main grid as the crow flies, and the top edge of welding is alignd with the top edge of main grid place, then use electric iron to weld from the upper edge of welding, keep solder horn to be that a certain oblique weld angle is at the uniform velocity soldered to welding destination county from the top down along welding; This soldering angle β controls within the scope of 30 ° ~ 50 °, and every root bead connects speeds control within the scope of 2-5mm/s; Described welding is the painting tin red copper welding that copper content is greater than 99.96%, and the yield strength of welding is 40 ~ 60MPa.
Further, the welding procedure of welding on aforesaid solar battery sheet, wherein, the preheat temperature of described preheating apparatus controls within the scope of 50 ~ 70 DEG C, and the tilt angle alpha of preheating apparatus and workbench is 10 ~ 30 degree.
Further, the welding procedure of welding on aforesaid solar battery sheet, wherein, locating piece described in step (1) is the two-sided blob of viscose of high temperature, the two-sided blob of viscose of high temperature bonds with preheating apparatus and strip high temperature cloth respectively, the thickness of the two-sided blob of viscose of high temperature slightly larger than the thickness of cell piece, thus enables cell piece easily put into or takes out between preheating apparatus and strip high temperature cloth.
Further, the welding procedure of welding on aforesaid solar battery sheet, wherein, in step (1) from the extension elongation of the strip high temperature cloth of extension locating piece be 3.5 ~ 4.5mm.
The invention has the beneficial effects as follows: one, in welding process, reduce the temperature difference between solder horn and solar battery sheet by the pre-heat effect of preheating apparatus, reduce thermal stress, effectively reduce solar battery sheet and occur the cracked or hidden phenomenon split, two, make to leave certain spacing between welding top edge and the top edge of solar battery sheet, on solar battery sheet simultaneously outside welding terminal, liner has the strip high temperature cloth of extension, in welding process, the area of dissipation at welding starting point place can be increased, the solar battery sheet reducing welding starting point place produces the cracked or hidden phenomenon split because being heated uneven, simultaneously, on solar battery sheet outside welding terminal, liner has the strip high temperature cloth of extension, the unnecessary scolding tin in welding process, welding piled up will be pulled in strip high temperature cloth, to prevent tin sweat(ing), scruff remains on solar battery sheet, the fragment rate of solar battery sheet is made to reduce 10% ~ 15%, thus greatly reduce the production cost of enterprise.
Accompanying drawing explanation
Fig. 1 is the welding schematic diagram of welding on solar battery sheet of the present invention.
Fig. 2 is the structural representation that Fig. 1 overlooks direction.
Detailed description of the invention
Below in conjunction with accompanying drawing and preferred embodiment, technical solutions according to the invention are described in further detail.
As shown in Figure 1 and Figure 2, the welding procedure of welding on the solar battery sheet described in the present embodiment, described welding procedure step is:
(1) solar battery sheet 5 is faced up be placed on welding tooling, and the main grid 8 on solar battery sheet 5 is longitudinally arranged towards operator, described welding tooling comprises: workbench 1, workbench 1 is fixedly installed preheating apparatus 2, preheating apparatus 2 is obliquely installed, solar battery sheet 5 is placed on the operation of preheating apparatus 2 carrying out welding welding, a locating piece 3 is fixedly installed in the lower end of preheating apparatus 2, the lower end of the solar battery sheet 5 be placed on preheating apparatus 2 is fixed by locating piece 3, to prevent solar battery sheet 5 slippage downwards in welding process, locating piece 3 is fixedly installed one piece of strip high temperature cloth 4, strip high temperature cloth 4 to be adhered fixed on locating piece 3 and to stretch out, before welding, strip high temperature cloth 4 liner of extension is being welded on the solar battery sheet 5 outside terminal.
(2) preheating apparatus 2 preheating, the 500-3C type electric iron that employing can directly buy also preheats solder horn 6, makes it reach welding temperature; Welding temperature controls within the scope of 320 ~ 360 DEG C, compare traditional welding temperature and reduce about 20 DEG C, the operating temperature of solder horn 6 also correspondingly reduces about 20 DEG C, the service life of solder horn 6 extends, and extends on average replacing in an every 10 days solder horn 6 by average within every 5 days, changing a solder horn 6; Make that scolding tin exceeds main grid 8, tin silk is dilatory waited weldering phenomenon to reduce 20% ~ 30% simultaneously.
(3) welding 9 is covered on main grid 8 as the crow flies, and the top edge of welding 9 is alignd with the top edge of main grid 8 place, then use electric iron to weld from the upper edge of welding 9, keep solder horn 6 to be at the uniform velocity soldered to welding destination county along welding 9 from the top down in a certain oblique weld angle; This soldering angle β controls within the scope of 30 ° ~ 50 °, and the speed of welding of every root bead band controls within the scope of 2-5mm/s; Described welding 9 is greater than the painting tin red copper welding of 99.96% for copper content, and the yield strength of welding is 40 ~ 60MPa; In the present embodiment, in welding welding process, first from first main grid of operator left-hand side, weld welding, follow the principle of welding successively from left to right, until four root bead bands are all welded on four main grids respectively.
In the present embodiment, the preheat temperature of described preheating apparatus 2 controls within the scope of 50 ~ 70 DEG C, and preheating apparatus 2 is 10 ~ 30 degree with the tilt angle alpha of workbench 1; In the present embodiment, locating piece 3 described in step (1) is the two-sided blob of viscose of high temperature, the two-sided blob of viscose of high temperature bonds with preheating apparatus 2 and strip high temperature cloth 4 respectively, the thickness of the two-sided blob of viscose of high temperature slightly larger than the thickness of solar battery sheet 5, thus makes solar battery sheet 5 easily can put into or take out between preheating apparatus 2 and strip high temperature cloth 4; In the present embodiment, in step (1) from the extension elongation of the strip high temperature cloth 4 of extension locating piece 3 be 3.5 ~ 4.5mm.
Advantage of the present invention is: one, in welding process, reduces the temperature difference between solder horn 6 and solar battery sheet 5 by the pre-heat effect of preheating apparatus 2, reduces thermal stress, effectively reduces solar battery sheet 5 and occurs the cracked or hidden phenomenon split, two, make to leave certain spacing between the top edge of the top edge of welding 9 and solar battery sheet 5, on solar battery sheet 5 simultaneously outside welding terminal, liner has the strip high temperature cloth 4 of extension, in welding process, the area of dissipation at welding starting point place can be increased, the solar battery sheet 5 reducing welding starting point place produces the cracked or hidden phenomenon split because being heated uneven, simultaneously, on solar battery sheet 5 outside welding terminal, liner has the strip high temperature cloth 4 of extension, the unnecessary scolding tin in welding process, welding 9 piled up will be pulled in strip high temperature cloth 4, to prevent tin sweat(ing), scruff remains on solar battery sheet 5, the fragment rate of solar battery sheet is made to reduce 10% ~ 15%, thus greatly reduce the production cost of enterprise.